title: Alkali borosilicate glass by fly ash from a coal-fired power plant.
abstract: The possibility of using coal fly ash as a silica source for alkali borosilicate glass was investigated. Alkali borosilicate glasses were prepared from the coal fly ash mixed with 30 wt.% reagents composed of Na(2)O and B(2)O(3) by susceptor-induction heating. Their densities ranged from 2.24 to 2.55 g cm(-3) and decreased as the amount of B(2)O(3) addition increased. However, the Vickers microhardness showed a different tendency with the density since the glass network connectivity improved by boron anomaly, which was identified by a nuclear magnetic resonance analysis. The Vickers microhardness of the glass product, with the addition of 15 wt.% B(2)O(3) and 15 wt.% Na(2)O, was about 4030 MPa. Furthermore, the changes in microstructure were consistent with those in the chemical stability by the toxicity characteristic leaching procedure (TCLP).
authors.affiliation: Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8579, Japan.
authors.forename: Jong Soo
authors.initials: JS
authors.lastname: Park
authors.forename: Shoji
authors.initials: S
authors.lastname: Taniguchi
authors.forename: Young Jun
authors.initials: YJ
authors.lastname: Park
mesh_terms: D000468:Alkalies / Q000737:chemistry; D001895:Boron / Q000737:chemistry; D002244:Carbon / Q000032:analysis / Q000737:chemistry*; D003031:Coal; D060729:Coal Ash; D005898:Glass / Q000032:analysis / Q000737:chemistry*; D006358:Hot Temperature; D009682:Magnetic Resonance Spectroscopy; D019216:Metals, Heavy / Q000737:chemistry; D052638:Particulate Matter / Q000032:analysis / Q000737:chemistry*; D011210:Power Plants; D017640:Silicates / Q000737:chemistry
chemical_list: D000468:Alkalies; D003031:Coal; D060729:Coal Ash; D019216:Metals, Heavy; D052638:Particulate Matter; D017640:Silicates; D002244:Carbon; D001895:Boron